Rydberg atom primer notebook link

[Json-To-String]

Hi, thank you for the great tool!

It seems that the docstring links that want to point to the Rydberg_atoms_a_primer_notebook html output might have gone stale, in which case a change of the form:

--- a/arc/alkali_atom_functions.py
+++ b/arc/alkali_atom_functions.py
@@ -402,7 +402,7 @@ class AlkaliAtom(object):
         See `calculation of basic properties example snippet`_.

         .. _`calculation of basic properties example snippet`:
-            ./Rydberg_atoms_a_primer.html#General-atomic-properties
+            https://arc-alkali-rydberg-calculator.readthedocs.io/en/latest/Rydberg_atoms_a_primer_notebook.html#General-atomic-properties

for every occurrence should fix it. I'm happy to supply a PR if this would be the preferred fix.